CN111366427A - Method for preparing columnar joint rock sample - Google Patents
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- CN111366427A CN111366427A CN202010129642.7A CN202010129642A CN111366427A CN 111366427 A CN111366427 A CN 111366427A CN 202010129642 A CN202010129642 A CN 202010129642A CN 111366427 A CN111366427 A CN 111366427A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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Abstract
The invention discloses a method for preparing a columnar joint rock sample, which comprises the steps of selecting a region needing to be researched for columnar joint, and acquiring three-dimensional digital information of each joint rock mass in an irregular columnar joint rock mass; then, adopting hot-melt resin as a rock-like joint material and applying a 3D printing columnar joint mould; and then, injecting cement paste into the mold by a vacuum negative pressure method by using a gas-liquid balance principle, and curing. When the cement slurry enters a plastic state, the resin is heated and softened, and simultaneously, the dislocation moment is applied to make the sample dislocated along the preset dislocation zone. The method adopts the meltable epoxy resin to simulate the joint model, the property of the epoxy resin is closer to that of real rocks, the characteristics of the columnar joints of the rock mass can be truly reflected, and the problems that the complete columnar joint rock mass sample at the site dam foundation is difficult to collect, the joints are easy to be broken by external stress in the coring process and the like are solved.
Description
Technical Field
The invention belongs to the technical field of rock mechanics and engineering, and particularly relates to a method for preparing a columnar joint rock sample.
Background
Rock mass in major projects of high mountain canyon regions is mostly complex multiphase medium discontinuous bodies, and the rock mass is divided by a large number of weak structural surfaces such as joints, cracks, faults, broken zones and the like. In the case of a Jinshajiang white crane beach hydropower station, the dam foundation rock mass in the dam site area mostly contains basalt with developed columnar joints. The columnar joints are mainly formed by slender columns, and the sections of the columnar joints are mainly irregular quadrangles, pentagons and hexagons. In a columnar joint intensive development area, the rock mass structure is broken complicatedly, the integrity and the mechanical property are poor, and obvious non-uniformity, non-continuity, non-linearity and anisotropy are shown.
Because the ideal rock sample with the built-in columnar joint is difficult to obtain at the site dam foundation by a manual mechanical drilling mode, a method for preparing the rock sample with the interlaminar dislocation columnar joint by using rock-like materials in a laboratory is necessary to be designed, and the rock-like materials have the characteristics of strong plasticity, simple manufacture, low manufacturing cost, strong pertinence and the like, so that the problems of easy crushing, easy disturbance, difficult operation and the like in the preparation process of the rock sample are solved.
Disclosure of Invention
In order to solve the problems that a complete columnar joint rock sample at a dam foundation is difficult to collect on site, a joint is easy to break due to external stress in a coring process, and the like, a method for preparing an interlaminar dislocation columnar joint rock sample by using meltable epoxy resin is provided, and a joint model is simulated by using the meltable epoxy resin.
The specific technical scheme of the invention is as follows:
a method of preparing a columnar jointed rock sample, comprising the steps of:
s1: selecting an area needing to study columnar joints on a rock mass, and acquiring three-dimensional digital information of each joint rock mass in the rock mass;
s2: adopting hot-melt resin and applying a 3D printing technology to print a columnar joint mould;
s3: reversely pressing the cement paste into the mould in a manner of pumping negative pressure in the joint mould under a vacuum environment; by utilizing the gas-liquid balance principle, the speed of cement slurry entering the mold is controlled by changing the internal and external air pressure, and the quality uniformity of the cement slurry is ensured. Under the negative pressure condition, the air in the holes of the rock sample is less, and the entering speed of cement paste is accelerated, so that the stabilization time of the rock sample reaching the gas-liquid balance is shortened. The problem that small holes are difficult to slip at normal atmospheric pressure is well solved, and the compactness and integrity of the sample are guaranteed.
S4: when the cement paste enters a plastic state, heating and softening the resin to generate cementation and plasticity, and applying a dislocation moment to make the sample dislocated along a preset dislocation zone;
in order to simulate the interlayer dislocation of the columnar jointed rock mass, a dislocation zone with a certain inclination angle is preset when a joint model is manufactured. The material thickness of the dislocation belt is thin, the strength is low, and the dislocation is easy. In the casting molding process, the hot-melt resin is heated and softened to have certain plasticity and the plasticity of cement paste, and the dislocation moment is applied to enable the sample to slightly dislocate on a preset dislocation band, so that the problem that the sample is damaged by the conventional method for the cutting and bonding operation of interlayer dislocation post-treatment is solved.
S5: cooling and hardening the hot melt resin to bond the cylinders together;
s6: and (5) post-processing.
Further, the three-dimensional digital information in step S1 includes acquiring geometric similarity ratio C1And volume-weight similarity ratio CYObtaining the strength similarity ratio C of the rock mechanical parametersR＝C1×CYRatio of similarity to modulus of elasticity CE＝C1×CY。
Further, the hot-melt resin in step S2 is an epoxy resin, and a curing agent and rubber powder are added thereto.
The property of the epoxy resin is closer to that of real rocks, and the columnar joint characteristics of rock masses can be truly reflected. And is heated to soften so as to flow, and then hardened and formed after cooling. Compared with the conventional method (after the column body is formed, a mixture of river sand, gypsum and water is injected into the joint network), the method avoids the crushing of the columnar joint caused by pulling out the joint insert after pouring, and also simplifies the complexity of later cementing operation.
Further, in step S4, the cement slurry is prepared from cement, standard sand, rubber powder, an early strength water reducing agent and an anti-freezing agent.
The cement paste prepared by the method has the characteristics of stable property, easiness in molding, short solidification time, convenience in crack presetting and the like.
Further, the post-processing in step S6 includes maintaining, removing the mold, and grinding for shaping.
The invention has the beneficial effects that:
the method adopts the meltable epoxy resin to simulate the joint model, the property of the epoxy resin is closer to that of real rocks, the characteristics of the columnar joints of the rock mass can be truly reflected, and the problems that the complete columnar joint rock mass sample at the site dam foundation is difficult to collect, the joints are easy to be broken by external stress in the coring process and the like are solved. Compared with the conventional method, the method avoids the crushing of the columnar joint caused by pulling out the joint insert after pouring, and also simplifies the complexity of the later cementing operation.
Drawings
FIG. 1 is a flow chart of the operation of a method;
fig. 2 is a schematic diagram of a default dislocation band.
Detailed Description
The invention is further elucidated with reference to the drawings and the detailed description.
Referring to fig. 1, the method for preparing a columnar joint rock sample comprises the following steps:
s1: selecting an area needing to study columnar joints on a rock mass, and acquiring three-dimensional digital information of each joint rock mass in the rock mass; the three-dimensional digital information comprises a geometric similarity ratio C1And volume-weight similarity ratio CYObtaining the strength similarity ratio C of the rock mechanical parametersR＝C1×CYRatio of similarity to modulus of elasticity CE＝C1×CY。
S2: printing the columnar joint mould by adopting epoxy resin and applying a 3D printing technology; wherein, the epoxy resin is added with a curing agent and rubber powder.
S3: adopting a mode of pumping negative pressure in the joint mould under a vacuum environment to reversely press cement slurry prepared by cement, standard sand, rubber powder, an early strength water reducing agent and an antifreezing agent into the mould; by utilizing the gas-liquid balance principle, the speed of cement slurry entering the mold is controlled by changing the internal and external air pressure, and the quality uniformity of the cement slurry is ensured. Under the negative pressure condition, the air in the holes of the rock sample is less, and the entering speed of cement paste is accelerated, so that the stabilization time of the rock sample reaching the gas-liquid balance is shortened. The problem that small holes are difficult to slip at normal atmospheric pressure is well solved, and the compactness and integrity of the sample are guaranteed.
S4: when the cement paste enters a plastic state, heating and softening the resin to generate cementation and plasticity, and applying a dislocation moment to make the sample dislocated along a preset dislocation zone;
as shown in fig. 2, in order to simulate the interlaminar dislocation of the columnar jointed rock mass, a dislocation zone with a certain inclination angle is preset when the jointing model is manufactured. The material thickness of the dislocation belt is thin, the strength is low, and the dislocation is easy. In the casting molding process, the hot-melt resin is heated and softened to have certain plasticity and the plasticity of cement paste, and the dislocation moment is applied to enable the sample to slightly dislocate on a preset dislocation band, so that the problem that the sample is damaged by the conventional method for the cutting and bonding operation of interlayer dislocation post-treatment is solved.
S5: cooling and hardening the hot melt resin to bond the cylinders together;
s6: and (5) post-processing.
Claims (5)
1. A method of preparing a columnar jointed rock sample, comprising the steps of:
s1: selecting an area needing to study columnar joints on a rock mass, and acquiring three-dimensional digital information of each joint rock mass in the rock mass;
s2: adopting hot-melt resin and applying a 3D printing technology to print a columnar joint mould;
s3: reversely pressing the cement paste into the mould in a manner of pumping negative pressure in the joint mould under a vacuum environment;
s4: when the cement paste enters a plastic state, heating and softening the resin to generate cementation and plasticity, and applying a dislocation moment to make the sample dislocated along a preset dislocation zone;
s5: cooling and hardening the hot melt resin to bond the cylinders together;
s6: and (5) post-processing.
2. The method of preparing a columnar joint rock specimen of claim 1, wherein the three-dimensional digital information in step S1 includes collecting a geometric similarity ratio C1And volume-weight similarity ratio CYObtaining the strength similarity ratio C of the rock mechanical parametersR＝C1×CYRatio of similarity to modulus of elasticity CE＝C1×CY。
3. The method for preparing a columnar joint rock sample according to claim 1, wherein the hot-melt resin in step S2 is an epoxy resin, and a curing agent and a rubber powder are added thereto.
4. The method for preparing the columnar joint rock sample according to claim 1, wherein the cement slurry in the step S3 is prepared from cement, standard sand, rubber powder, an early strength water reducing agent and an antifreezing agent.
5. The method for preparing a columnar joint rock specimen according to claim 1, wherein the post-processing in the step S6 comprises curing, demolding and grinding.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010129642.7A CN111366427B (en) | 2020-02-28 | 2020-02-28 | Method for preparing columnar joint rock sample |
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| CN202010129642.7A CN111366427B (en) | 2020-02-28 | 2020-02-28 | Method for preparing columnar joint rock sample |
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| CN111366427B CN111366427B (en) | 2023-04-07 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114136747A (en) * | 2021-11-23 | 2022-03-04 | 中铁二十局集团第四工程有限公司 | Method for manufacturing rock sample containing complex joints |
| CN114459855A (en) * | 2022-01-26 | 2022-05-10 | 中国电建集团华东勘测设计研究院有限公司 | Sample preparation mold and sample preparation method for complex rock mass structure containing multilayer interlayer dislocation zone and columnar joint |
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| CN105486555A (en) * | 2015-11-20 | 2016-04-13 | 河海大学 | Method for preparing columnar jointed rock mass model containing blind joints and interlayer shear belts |
| CN105651570A (en) * | 2015-12-29 | 2016-06-08 | 河海大学 | Preparation method of columnar jointed rock mass sample containing unfilled blind joints |
| CN108372571A (en) * | 2018-02-09 | 2018-08-07 | 河海大学 | A kind of preparation method of prismatical joint rock-like materials sample |
| WO2018209990A1 (en) * | 2017-05-16 | 2018-11-22 | 山东大学 | Method and device for preparing karst cave based on 3d printing technology |
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2020
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| CN105486555A (en) * | 2015-11-20 | 2016-04-13 | 河海大学 | Method for preparing columnar jointed rock mass model containing blind joints and interlayer shear belts |
| CN105651570A (en) * | 2015-12-29 | 2016-06-08 | 河海大学 | Preparation method of columnar jointed rock mass sample containing unfilled blind joints |
| WO2018209990A1 (en) * | 2017-05-16 | 2018-11-22 | 山东大学 | Method and device for preparing karst cave based on 3d printing technology |
| CN108372571A (en) * | 2018-02-09 | 2018-08-07 | 河海大学 | A kind of preparation method of prismatical joint rock-like materials sample |
| CN110376030A (en) * | 2019-07-05 | 2019-10-25 | 河海大学 | A kind of preparation method of irregular prismatical joint rocks sample |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114136747A (en) * | 2021-11-23 | 2022-03-04 | 中铁二十局集团第四工程有限公司 | Method for manufacturing rock sample containing complex joints |
| CN114459855A (en) * | 2022-01-26 | 2022-05-10 | 中国电建集团华东勘测设计研究院有限公司 | Sample preparation mold and sample preparation method for complex rock mass structure containing multilayer interlayer dislocation zone and columnar joint |
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| CN111366427B (en) | 2023-04-07 |
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